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Synology DSM 7 Hands-on Review: A New and (Mostly) Great NAS Experience

Last month marked the availability of Synology’s much-anticipated worldwide release of the well-known NAS operating system, DSM 7. As of the morning of June 29, 2021, you can download the official OS image and manually update a supported server.

DSM stands for DiskStation Manager, and version 7.0 is the latest. It’s the first and exciting major upgrade in five years. But just because it’s available doesn’t mean you should upgrade your NAS box right away.

Indeed, while DSM 7 is totally worth the wait — it’s the latest and much-improved version of arguably the best NAS software — I’d still recommend certain users to wait a bit longer before putting it on their production server.

You’ll find out why when through with this post, among other things.

Dong’s note: I first published this post as a preview on June 2, 2021, when DSM 7.0 Release Candidate (RC) was announced and last updated it to a hands-on review on July 11 after more than a month of testing.

DSM 7 Icons
Synology DSM 7.0 has a much better interface and comes with improved apps.

Synology DiskStation Manager (DSM) 7


Design and Features


Easy of Use







  • Comprehensive, streamlined, and significantly more responsive user interface
  • Robust set of features for home and business users
  • Improved apps
  • Better security
  • Free


  • No USB dongles and ext3 support
  • Some popular features and (third-party) DSM 6-based apps no longer available or (fully) supported
  • Updated/new apps can be buggy

Synology DSM 7: An overall major improvement with some surprises

OK, I’m one of those who couldn’t wait to try DSM 7.0 out. And in my up-to-now experience, the new release is a win. It has a host of improvements, most notably in the user experience.

But let’s get one thing out of the way: You won’t see faster network data throughputs with it. So far, I’ve seen no discernible difference in file copying speeds between DSM 7 and DSM 6.

The reason is a server’s network ports generally limit data speeds, and home Synology NAS so far are all Gigabit.

Some servers, like the DS1621+ or DS1618+, do have the option for 10Gbps via a PCIe add-on adapter. Still, you’ll need a Multi-Gig switch and a similarly capable computer to experience that.

And even then, keep in mind that most NAS servers use regular hard drives with the technical cap speeds of SATA 3, which is 6Gbps.

The point is don’t expect DSM 7 to make data move between your NAS server and network devices faster magically. But still, there is plenty to love about the new OS.

The improvements

For one, when working with the server itself, you’ll note that the interface is now significantly more responsive. Even the login process is much shorter — it’s almost instantaneous.

This responsiveness a consistent improvement — you’ll experience it in all servers, no matter the specs or storage types.

On top of that, all changes take less time to apply. And tasks within the server itself have vastly improved all around. What’s more, things are more organized and streamlined — you can get things done via fewer steps.

Specifically, the Control Panel now has fewer items, yet, you can get the settings done more quickly.

Note that things have been moved around a little bit.

For example, the Share Folder Sync function — an excellent feature to sync data between two or more servers in real-time — is now part of the File Services instead of its own section. Or QuickConnect is now part of External Access, which also includes DDNS and Router Configuration.

But with the improved search function, you’ll be able to find every setting you need without knowing exactly where it lies.

DSM 7 0 Login Screen
DSM 7’s security feature now includes two-step verification enforced on an individual account or a user group.

There’s also much better security support, including:

  • The support for two-step authentication where, among the options, you can use a phone app to approve the access via a tap on the screen.
  • The QuickConnect remote management feature now automatically gets a free SSL certificate.

The storage management system is significantly improved with better SSD cache control, faster RAID rebuild. And there are more handy tools for home and business users.

So, overall, DSM 7 looks, feels, and runs better. It proved in my trial to be a lighter-weight operating system across the board. It uses fewer resources for itself than DSM 6.

As a result, it makes managing any supported server, including a low-end one, a real pleasure. The longer you use it, the more you’ll find that DSM 7 makes sense.

The surprises

But DSM 7.0 is not free of headaches.

Right off the bat, keep in mind that it won’t run everything that works in DSM 6. So if you assumed that you could carry on NASsing (I made up that word) your merry way the same as you have in the past five years, you’d likely be disappointed.

No more ext3 support

And the ditching of ext3 — not to be confused with ext4, which DSM 7 does support — might be the biggest headache of all.

Indeed, DSM 7.0 no longer supports ext3 in favor of the much more advanced Btrfs alternative. And for the most part, that’s a good thing.

One of Btrfs’ many benefits is that it supports Snapshot and Replication, a shadow copy method that keeps your data safe from a ransomware attack. So I definitely recommend this file system. (Hint: Don’t bother with ext4 if Btrfs is an option!)

However, ext3 was once the most popular file system across the Synology servers — and many Linux servers, for that matter.

The way Synology NAS works, you can migrate from one server to another by moving the internal drives over and use SHR to scale up storage space without turning the server off.

As a result, many users still use the ext3 file system in their latest Synology boxes after multiple server and storage upgrades. If it ain’t broke, don’t fix it, they say. Well, it’s broke now.

Indeed, the issue is, a Synology server must run Btrfs (or ext4) before you can upgrade it to DSM 7.0, and migrating from ext3 to Btrfs (or ext4) can be a pain.

That’s because there’s no in-place conversion. Instead, you will need to back up data and settings to a temporary storage device, remove the current ext3 storage pool/volume and rebuild it from scratch. Then restore data and system settings.

Depending on the amount of data you have, migrating to Btrfs can take hours or even days. I speak from experience — since the release of DSM 7 beta, I’ve upgraded a dozen servers or so to Btrfs.

And if you don’t want to take your server offline during the process, the only way is to get an additional server for the task — not a bad idea if you want a backup server anyway.

By the way, some (older) NAS models don’t support Btrfs or ext4 — they won’t get DSM 7 at all.

(Many) third-party apps not (fully) or not yet supported

The power of any Synology NAS server has always been in the apps (or packages). And this is where things get complicated.

Sure, there is a long list of apps immediately supported in DSM 7.0. In fact, if you use only Synology apps, chances are you won’t run into any major problems.

However, many third-party apps might take time to get (fully) supported. Some are dropped completely. For example, the popular Plex server, a well-established app within DSM 6, is now in the beta section of DSM 7.

Considering its popularity, my take is Plex won’t take long to get fully supported. But less well-known apps — including those I’m not aware of — might not be that lucky. And again, some sure are no longer supported at all.

Third-party apps and DSM 7 compatibility

The table below, provided by Synology, shows the statuses of popular third-party apps that work with DSM 6.2 and their DSM 7.0 compatibility as of the end of June 2021.

There’s no timeline for when an app will get fully supported, but all on the list will eventually work.

  • V : Currently supported by DSM 7.0
  •  : To be supported
Package NameCompatibility Status
Acronis TrueImage
Data Deposit Box BackupV
DiXiM Media ServerV
Nakivo Backup and Replication
Nakivo Transporter
Plex Media ServerV
Resilio Sync
Sony BraviaMeetingV
Sony BraviaSignage
sMedio DTCP MoveV
Onewu downloadV
Synology DSM 7.0’s third-party support list.

And there is a long list of apps that won’t work with DSM 7.0.

Apps that are no longer supported

Indeed, if you use any of the following known apps, however, you’re totally out of luck. This is the list of apps that won’t work with DSM 7.0:

  • Synology apps:
    • Cloud Station Server (replaced by Synology Drive Server),
    • Cloud Station ShareSync (replaced by Synology Drive Server),
    • Photo Station (replaced by Synology Photos),
    • Moments (replaced by Synology Photos).
  • Third-party packages: Discourse, DokuWiki, Drupal, Drupal8, DVBLink, GitLab, GLPI, Hasplm, Java7, Java8, LimeSurvey, Logitech Media Server, LXQt, Magento, Magento2, MantisBT, Mono, Moodle, Node.js 0.10, Node.js 0.12, Node.js v4, Node.js v6, Node.js v8, Odoo 8, OpenERP 6.1, OpenERP 7.0, OrangeHRM, Orthanc, osCommerce, osTicket, PHP PEAR, phpBB, Piwik, Podcast Generator, PrestaShop, PrestaShop1.7, PythonModule, Redmine, Ruby, Spree, SugarCRM, SVN, Synology File Manager, Syncthing, Tomcat6, Tomcat7, TVMosaic, and Webalizer.
DSM 7 0 Beta Apps
The list of beta apps on official DSM 7.0.

Bye-bye USB dongles

Aside from apps, DSM 7.0 also comes with what I’d call a deal-breaker, for now, for many users: It doesn’t support USB dongles — the things you plug into a server’s USB port.

See also  Synology Mesh Review: Home Wi-Fi Turned Pro

On this front, Synology told me:

“Unfortunately, we have ended support for USB dongles on our NAS devices. DSM 7.0 is our biggest update yet and required major overhauls of the subsystem and our applications. As such, the drivers that do work in DSM 6.0 are unable to work in DSM 7.0. For the USB devices to work on DSM 7.0, the manufacturers of these devices will have to develop new drivers compatible with DSM 7.0. Those drivers must be tested to ensure there are no potential security risks. So until said manufacturers start rolling out driver updates, USB will be used for external storage as the main use case. “

That means, for the foreseeable future, DSM 7.0 only supports USB external storage use. So if you’re using portable and thumb drives for data sharing and backup purposes, that will work like it always has.

On the other hand, any other USB add-on devices, such as Wi-Fi, Ethernet, Bluetooth, cellular, speaker, DTV adapters, and so on, will no longer work.

This might change at some point, but I’d not count on it. In the future, Synology might produce some of these accessories itself. To a certain extent, with DSM 7.0, Synology seems to reveal its desire to exert more control over its hardware.

So yes, Synology has gotten big. If you’re an Apple user, especially one who drank the cool-aid and upgraded their (older) Macs to Big Sur, you’ll catch my drift.

Synology DSD1621 NAS 1
The DS1621+ is one of many Synology servers that will run DSM 7.0 really well.

Synology DSM 7.0: Lists of supported NAS servers

Wondering if you can load DSM 7.0 on your existing server? The answer is highly likely. (Naturally, all new Synology servers will support it.)

The new OS version supports NAS servers as old as those released back in 2013, though not all, and it’s a free upgrade — similar to Windows 10 (or Windows 11, for that matter).

Below is the full list, provided by Synology, of existing servers on which you can install DSM 7.0.

(Per Synology’s naming convention, the digits at the end of the model signify the release year.)

  • 21-series: RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+, DS1821+, and DS1621+.
  • 20-series: RS820RP+, RS820+, DS1520+, DS920+, DS720+, DS620slim, DS420+, DS420j, DS220+, DS220j, and DS120j.
  • 19-series: RS1219+, RS819, DS2419+II, DS2419+, DS1819+, DS1019+, DS419slim(*), and DS119j.
  • 18-series: RS2818RP+, RS2418RP+, RS2418+, RS818RP+, RS818+, DS1618+, DS918+, DS718+, DS418, DS418play, DS418j, DS218+, DS218, DS218play, DS218j, and DS118.
  • 17-series: RS217, DS1817+, DS1817, DS1517+, and DS1517.
  • 16-series: RS2416RP+, RS2416+, RS816, DS916+, DS716+II, DS716+, DS416, DS416play, DS416slim, DS416j, DS216+II, DS216+, DS216, DS216play, DS216j, DS216se, and DS116.
  • 15-series: RS815RP+, RS815+, RS815, DS2415+, DS1815+, DS1515+, DS1515, DS715, DS415+, DS415play, DS215+, DS215j, DS115, and DS115j.
  • 14-series: RS2414RP+, RS2414+, RS814RP+, RS814+, RS814, RS214, DS414, DS414slim, DS414j, DS214+, DS214, DS214play, DS214se, and DS114.
  • 13-series: DS2413+, DS1813+, DS1513+, DS713+, and DS213j.

(*) The DS419slim is an interesting example of a NAS server that doesn’t support Btrfs but only ext4, as mentioned in my review. It can run DSM 7 but won’t get all the benefits of the new OS.

By the way, just because a server is on the list above doesn’t mean all its features are available. For example, video conversion to FLV and MPEG-4 Part 2 formats is no longer available in many models after upgrading to DSM 7.0.

Synology DSM 7: How to upgrade

With the issues mentioned above out of the way — consider yourself warned! — here’s how you can upgrade to DSM 7 right now.

Go to Synology’s download center, enter your server model. If it’s supported, you’ll find the DSM 7.0 image for it. The official version starts at build number 7.0-41890. Download the image — it’s a .pat file — on your computer.

After that, log into the server’s interface, open the Control Panel and navigate to the Update & Restore section. Choose to do a Manual DSM Update and upload the download .pat file to the server.

The rest is self-explanatory.

DSM 7 0 Upgrade Warning
You can upgrade to DSM 7.0 via the Update & Restore section of the Control Panel. Note the warning that most of us might ignore (probably to some’s regret.)

By the way, the existing DSM 6.2 will not auto-detect DSM 7 as an update. That only works for the later builds of DSM 6 itself. However, if your server is running DSM 7.0 RC or beta, chances are you’ll see the official build available.

But in any case, it’s best to upgrade to the official build manually, as mentioned above. After that, just like DSM 6, you can expect regularly updated builds of DSM 7 going forward.

DSM 7 vs DSM 6.2: Screenshots

Below are some screenshots showing how DSM 7 differs from DSM 6.2 in the user interface. Use the slider on each frame to see the differences.

Before Image After Image
The login screen

Before Image After Image
The Desktop

Before Image After Image
The Control Panel

Before Image After Image
The Package Center

Before Image After Image
The items of the Control Panel

Before Image After Image
The Storage Manager app

Before Image After Image
Domain integration. You can upgrade from DSM 6 to DSM 7 without affecting the existing server's Domain/LDAP settings.

Before Image After Image
QuickConnect in DSM 7 now gets its own SSL certificate.

Should I upgrade now?

For this post, I upgraded a handful of servers from DSM 6.2 to the official version of DSM 7.0 (build 7.0-41890) — a DS1618+, a DS1019+, a DS713+, a DS1513+, DS419slim, and a DS1621+ — and all went well.

It’s important to note that none of those above run any third-party apps. And I do have a few other servers that I’ll keep DSM 6 on for now.

The upgrade processes took between 15 to 25 minutes, depending on the server. And that included the time needed to update all existing apps to their latest official builds.

During the upgrade, the server is not available for general use.

DSM 7 0 Auto Update
A server running DSM 7 RC or Beta will get the notification to update to the final version and has the option to auto-upgrade.

When it’s safe to upgrade

That said, if you’re running a beta or RC version of DSM 7.0, you should definitely upgrade to the official build immediately. There’s no reason not to.

Also, if you’re using DSM 6.2 but don’t rely on any third-party apps, you’re probably good to go, too.

Generally, if you run popular apps, chances are you will run into no or little problems. But do expect some hiccups.

I’ve noted that some supported apps didn’t function the same way they did with DSM 6 — they might need some time to mature under the new OS.

Extra: Some housecleaning before upgrade

A couple of things you should do within DSM 6.2 before performing an upgrade to DSM 7:

  • Update the server to the latest DSM 6 build avaible.
  • Update all apps to their latest version available.
  • Remove all the unused (or no longer supported) apps.
  • Migrate all Synology packages (and their clients) to applicable replacements as mentioned above. This is especially important with the case of CloudStation (replaced by Synology Drive.) In my trial, the Synology Drive client software didn’t update itself to the latest version, which can be an issue if you have multiple remote non-savvy users.)
  • Stop (remove) some services that can be easily re-enabled after the upgrade. Examples include VPN server, Link Aggregation,

When to hold up

Generally, if you’re using DSM 6.2 with many different (third-party) apps, it’s a good idea to hold up the upgrade for a couple of months to make sure your existing apps are fully compatible or find alternatives if they are not.

DSM 7 0 Release Candidate Update process
The DSM 7 upgrade process also updates all existing apps to their new official versions.

This is especially if you use a server for a mission-critical production role. In this case, don’t assume that everything will work out. While you can make DSM 7 work right now, you might run into unexpected issues, and there’s no help.

That said, if you rely on any of the following, it’s a good idea to wait for a few months or until next year:

  • iSCSI storage.
  • Third-party virtual machine (VMware etc.)
  • Third-party streaming server (Plex etc.)
  • Synology Drive as a remote backup/sync solution — the Synology Drive Client 3 is still quite buggy.
  • USB dongles of any type (including network adapters.)
  • Any mission critical third-party package.

It’s important to keep in mind that once you’ve upgraded to DSM 7, there’s no (easy) way to go back to DSM 6. With Synology servers, upgrading the software has always been a one-way street.

Sure, it is possible to reverse course, but the process is quite involved. It’s much harder than upgrading to DSM 7. And in the best-case scenario, you might still need to rebuild many of your DSM 6 NAS box’s settings. I tried.


DSM 7.0 sure is an exciting upgrade that rings in a lot of improvements.

But like all changes, it can require some getting used to. Together with it, you might have to say goodbye to apps and even add-on devices that you’ve grown accustomed to for years. And some supported apps still need time to mature fully.

The good news is DSM 7.0 is not a must-upgrade. You can take your time with it. Or even ignore it completely.

That said, spend some time trying it out if you have a spare server — you can use it with a Virtual Machine within many existing NAS models running DSM 6 — or wait and make the migration when you know for sure you’re ready. Patience is a virtue.

One thing is for sure: It’ll be years before you need to completely ditch DSM 6.2, which itself is still an excellent operating system. Synology will support the old OS for the rest of existing NAS servers’ life — some of them don’t even support DSM 7.0 at all.

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42 thoughts on “Synology DSM 7 Hands-on Review: A New and (Mostly) Great NAS Experience”

  1. Great guide and thank you, I think I’ll wait a little while on DSM 7 and avoid early adopters curse.

    Just something you might wish to add to your list of things you should do before upgrading in big bold red letters…..

    Make sure you have a back up of your data, you never know. Basic but surprising how many don’t and can never be repeated enough.

    • Totally agreed on the backup, An. However, that’s a daily matter, you shouldn’t do that only because you’re about to upgrade the OS. And the upgrade itself won’t cause data loss.

  2. Hi Dong,
    I mostly use my DS218 for private purposes. Can you provide any screenshots from a smart phone? For DSM6.2 I have a short menu with some settings only. The demo version on the synology site doesn’t load with my huawei p30

    • It’s similar in DSM 7, Marco. But you can access the full web user interface on a mobile browser by hitting the cogwheel ⚙️ on the said menu and choosing Desktop Mode.

  3. Dong, thanks to this post and my pretty much plain vanilla setup on my DS 220+, I took the leap and upgraded to DSM 7.0 and generally am very happy with it. I guess my only gripe is that Synology’s backup solution, Hyper Backup still has not been modified to play nice with Microsoft’s One Drive, where I have plenty of space for cloud-based backups from my NAS. Do you know of any workarounds that would allow reliable backups to One Drive using Hyper Backup, or failing that, whether Synology plans to modify Hyper Backup for DSM 7.0 so it works with One Drive?

      • Dong, thanks for the quick reply. I thought about using Cloud Sync as well, but Synology techs with whom I’ve communicated have told me that using Cloud Sync to One Drive (or Cloud Sync to some other cloud provider) merely is intended as a file syncing solution, rather than for the backup for an entire disk drive, and that Hyper Backup is the preferred backup solution for that. I guess I could get some utility out of using Cloud Sync, but that utility would seem to be limited if it won’t reliably backup my entire NAS drive.

        • You control the versions in the settings of OneDrive or Google Drive, Thomas. That’s the same as backup, if not better.

  4. “The issue here is that a Synology server must run Btrfs before you can upgrade it to DSM 7.0, and converting ext3 into Btrfs can be a pain.”

    I upgraded to DSM 7 on a 918 and 214 and did not have to upgrade to BTRFS. I don’t think the 214 even supports BTRFS.

    • Interesting, Tom. I had an issue with this during beta testing and spent days moving my servers to Btrfs… I’ll look into this. But you SHOULD use Btrfs anyway.

      • I was beta testing as well. I need to change to Btrfs but as you mentioned it is a real pain and my DS214 does not support it which creates some issues since the 218 backs up to the 214.

  5. Interesting to note that I can download DSM 7.0 Beta on my old DS-1513+ ( which has no drives at the moment)

    But there is no option for the DS-3617XS yet. I guess they don’t want to have beta software on their server class units yet. Guess I’ll have to wait for the offical release then.

  6. Does Synology Drive been improved when dealing with huge file library?
    I have a 1621+ as a video production station with 60TB of videos on it, with 6.2 we often have sync issues between clients (I have 5 computers connected to it). Hopefully, they improved it with DSM7.

    • You always have issues syncing large files, Nachi. That’s more of a bandwidth/user issue than the DSM version. That’s because it takes a long time to sync a single larger file alone. And if you keep editing that file, the sync will never finish. Also, remember that if two clients edit the same local file (of the synced folder) simultaneously, that will create conflicts, compounding that with the bandwidth issue, you’ll have a ton of problems.

      • My current network is 10Gigabit cards. I think it’s an algorithm issue. With Dropbox or Google drive sync rarely fails, but with Synology drive it happens every week. I think the “coding” does not rock solid yet. 60-70TB on dropbox is VERY expensive, that’s why we bought our own NAS. But the reliability of syncing is so-so.

        • You can get unlimited Google Drive via G-suite for less than $20/month, N. But online storage, again, is a matter of bandwidth, especially considering the cap imposed by some ISPs. So far, I’ve never had issues with Synology Drive, and the latest client version (3.x) seems to be working well.

  7. So far I’m really liking it, but I can’t believe there is still no dark mode (and I mean a proper dark mode not the silly option Synology have). I’ll still have to resort to a Chrome extension (Dark Reader) but I’d have thought they’d had done a bit more on theme options by now.

    Oh yes, File Station highlighting in light blue is still so hard to see too

  8. You say to upgrade Photo Station to Synology Photos first before upgrading to DSM 7 but it seems that Synology Photos requires DSM 7 before you can install it.

  9. Updated my DS218j to DSM 7.0 rc. My DS220+ is still running DSM6.x. Now CMS under Surveillance Station is broken. Says my DS218j is “incompatible” with my DS220+.

    Is this occurring because my disk stations are running different versions of DSM, or is CMS not going to be offered in DSM 7.0?

  10. Dong,
    Have you done any performance testing on DSM 7.0 RC? Does DSM 7.0 RC make improvements in file server speed?

    • Network performance is about the same, Robert, since that’s mostly limited by the ports. But the interface and general performance when you work with the server is MUCH faster. If you don’t have any special apps that might become incompatible, go for it! If you do, it’s a good idea to wait a month or two.

      • Somehow I seem to have messed up a certificate on one of my Synology NAS units. When I try to use the local IP address with port 5000 to login, it kicks me to the same IP address on 5001 (which is https which I don’t need). I have never really understood certificates, so I can’t figure out how this happened or how to fix it.

        Can you offer any suggestions on how to fix this? I hope I don’t need to create and import a new certificate. I admit, I do NOT know how to do that.

  11. The USB Dongle support also has me concerned. I currently use a QNAP QNA-UC5G1T on my 918+ via a custom driver created to support it (
    This has allowed me to have 5gbe on this NAS which otherwise wouldn’t support it. Given its a reasonably fast unit, especially with the m.2 cache drives, i’ve been able to get a big speed increase out of it.
    Would hate to lose this functionality with the update so will be paying close attention to ongoing support for this.

    • It’s unclear if USB Ethernet adapters are no longer supported, DK. But Wi-Fi dongles are not for sure. I think it’s better that you wait to make sure before upgrading.

  12. Dong, thanks for the heads-up on DSM v7.0. Can you be more specific about the “USB dongle” not being supported? I’ve been using a DS216+II for several years (happily, I might add) and I see it in the list of supported models. It does have a USB port which I use with the Hyper Backup app (not in the non-supported software list). Specifically, I do a daily one-off backup of my latest backup collection on the SAN to a stand-alone hard drive connected via the USB port. After the backup, the USB port is electronically disconnected from the SAN and thus the backup copy is isolated from my local network until I physically re-insert the USB cable before the next copy cycle. This is my virtual “off site” repository in case of a ransomware intrusion. Would this be considered a “USB dongle” that is no longer supported?

    • Sorry about the SAN references, it was a post-retirement conflation with years past experiences. Yes, it is indeed NAS we’re discussing here! Also believe I found some Synology info that says the USB connected storage access remains in v7.0, unless you say otherwise. Sorry for the concern.


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